Ball-bearing for dental-engine shafts



(No Model.) l I' Y A. W; BROWNE. W

BALL BEARING FOR DENTAL ENGINE SHAPTS.

No. 558,772. Patented Ap1-. 21, 1896.

Ff 7 FIG'.

WITNESSES: INVENTDR:

FFICE..

ARTHUR IV. BROV N E, OE PRINOES BAY, NEV YORK, ASSIGNOR TO 'THE S. S. IVIIITE DENTAL MANUFACTURING COMPANY, OF PHILADELPHIA,

PENNSYLVANIA.

BALL-BEARING FOR DENTAL-ENGINE SHAFTS.

SPECIFICATION forming part of Letters Patent No. 558,772, dated April 21, 1896. Application iiled October 18, 1895. Serial No. 566,072. (No model.)

To all whom t may concern.-

Be it known that I, ARTHUR W. BROWNE, a citizen of the United States, residing at Princes Bay, in the county of Richmond and State of New York, have invented certain new and useful Improvements in Ball-Bearings for Dental-Engine Shafts; and I do hereby declare the following to be a full, clear, and exact description of the invention, vsuch as will enable others skilled in the art to which'it appertains to make and use the same.

My invention relates to certain improvements in dental engines, as hereinafter claimed, applicable to the bearings for the driven shafts by way of which motion is coinmunicated to the tools to be operated.

In the accompanying drawings, Figure l is a view in elevation of the pitinan and the crank-pin having ball bearing connection therewith and adapted for attachment to the crank of the driving-shaft, and Fig. 2 is a view partly in vertical central section and partly in elevation at a right angle with Fig. l. Fig. 3 is a view partly inV elevation and partlyin vertical central section, as indicated by the line 3 of Fig. 4, showing the upper portion of the enginestandard, the pulley-head mounted at the top thereof, a portion of the driven shaft by way of which motion is communicated to the tool to be actuated, and the bearings for this shaft. Fig. 4. is a plan view showing a portion of the pulley-head with attachments thereof. Fig. 5 is a view, partly in elevation and partly in section, on the line 5 of Fig. li; Fig. 6, a view, partly in elevation and partly in section, on the line 6 of Fig. 4.

A dental engine of suitable construction for the application of my improvements is shown in United States Letters Patent No. 460,687, dated October G, 1891. As in said patent, provision is made for imparting motion by way of a treadle and pitman to a cranked drivin g-shaft and a drivin g-wheel thereon.

An adjustable ballbearing connection between the pitman D and the pin D', which is secured to the driving-shaft crank, is made in the following way: Abearing-openingE is provided in the enlarged upper end or head of the pitman, and this opening is screwthreaded to receive the two externallythreaded short sleeves E E2, which are formed with the annular inclined inner surfaces c e, thus adapting them to serve as conc bearing sleeves, which may be screwed in place and adjusted, as desired, by means of a Spannerwreneh adapted 'to engage the slots or nicks e in them. The crank-pin passes through the cone-bearing sleeves loosely or out of con* tact with them and is provided with the annular groove f, concave in cross-section and constituting a bearingsurface in contact with the antifriction-balls E, which are inclosed in the bearing-opening between the cone-bearing sleeves.

A slot G is formed in the pitman near its upper end and extends to the bearing-opening, and a clamp-screw g, passing through the pitinan and crossing the slot at or near its upper end, serves to slightly vary the size of the bearing-opening and so adapt it to properly embrace the cone-bearing sleeves.

It willbe seen that the parts may be quickly assembled to work with the least possible friction, and readily separated, and that wear may be taken up or compensated for by slight adjustment of the bearing-sleeves, while by adjustment of the screw g the bearing-sleeves may be clamped against accidental move* ment in the bearing-opening. Engagement of the balls with the grooved surface of the crank-pin obviously prevents the pitm an from becoming disconnected from the crank-pin- The rocking upright or standard H of the engine is made in sections, so as to be adjustable in length7 and carries a vertically-rocking and horizontally-turning pulleyhead II3 at its upper end, as is well understood.

Instead of the usual way of mounting the driven shaft by way of which motion is iinparted to the tool to be operated, this shaft is mounted as follows: The tubular portionI of the pulley-head provides a bearing-opening, in which the bearings for the driven shaft are mounted. This bearing-opening is pro- 95 vided at one end with an inclined or conebearing surface shown as formed by a short conebearing sleeve J, suitably fastened in place. Slightly separated from this xed cone-bearing sleeve is a longer cone-bearing IOO sleeve J, adjustable in the bearing-opening toward and from the lined bearing-sleeve. This adjustable sleeve is screw-threaded to engage the threaded bearing-opening. Another cone-bearing sleeve K is adjustable in the bearing-opening, with which it has screwthreaded connection, and projecting into the end of the bearing-openin g opposite that provided with the iiXcd cone-bearing sleeve J is a cone-bearing sleeve L, which is screwthreaded for engagement with the threaded bearin g-opening. A shoulder L on the sleeve L abuts against the end of the tube I, constituting the bearing-opening of the pulley-head when this sleeve is tightly screwed in place, so as to leave a slight space between its inclined inner end and the adjacent inclined end of the bearing-sleeve K. Holes 7a k are formed around the adjustable cone-bearing sleeves J K, and the pulley-head tube is formed with two transverse slots M M, through which a pin may be inserted to engage the holes in the sleeves J and K to turn and adj ust them. A slot 'm extends longitudinally of the pulley-head tube part way its lengthover the adjustable cone-bearin gs, and a clamp-screw N, passing through the lugs n n at opposite sides of the slot m, serves to compress the tube and securely clamp the adjustable conebearing sleeves in their position of adjustment.

Vithin the cone-bearing sleeves, but not in contact with them, is the tubular journal O of the driven shaft. This journal projects at one end beyond the bearing-opening and has the driven pulley P fastened to it by a screw p passing through the hub of the pulley. An annular shoulder or collar o is provided upon the journal O near its end opposite that to which the pulley is secured, and the end cone-bearing sleeve L has au internal shoulder Z formed upon it, which serves to limit outward movement of the tubular journal. This bearing-sleeve has its reduced end portion Z externally threaded for making connection in a well-known way with the sheath of the ordinary flexible driving-shaft. The stiff section Q of such ileXible driving-shaft is mounted in the journal O and revolves with it. The screw j?, entering the groove p eX- tendinglongitudinally of the shaft-section Q, (see dotted lines, Fig. 3,) causes it to rotate with the driven pulley and journal, while allowing it to have desirable slight endwise movement. Antifriction-balls R in contact with the driven-shaft journal O are confined between the inclined surfaces of the conebearing sleeves J and J and other antifriction-balls R, against which the journal bears, are conned between the inclined bearingsurfaces of the sleeves K and L.

It will be seen that the various parts of the driven-shaft bearings may be readily arranged in the bearing-opening of the pulleyhead and quickly detached, and that by adjustment of the pair of adjustable cone-bearing sleeves the balls may be kept in proper working contact with the journal and with the inclined surfaces of their respective bearing-sleeves, wear of the parts being easily taken up or compensated for.

I claim as my inventionl. The combination, in a dental engine, of the pulley-head provided with the bearingopening, the two non-adjustable cone-bearing sleeves, one within each end of said opening, the two cone-bearing sleeves between said non-adj ustable sleeves, having threaded connection with the bearing-openin g, adapted to be clamped therein, and independently adjustable to operate the one with the non-adjustable cone-'bearing sleeve at one end of the bearing-opening and the other with the nonadjustable cone-bearing sleeve at the opposite end of the bearing-opening, the journal in the cone-bearing sleeves, the two sets of balls in contact with the journal and with their respective adjustable and non adjustable bearing-sleeves, and means by which both the adjustable cone-bearing sleeves maybe either simultaneously clamped in position or simultaneously unclamped for Aadjustment without disarranging the parts', substantially as and for the purpose set forth.

2. The combination, in a dental engine, of the pulley-head provided with the tubular portion constituting the bearing-opening and having the transverse slots, the longitudinal slot, and the lugs at opposite sides of this longitudinal slot, the clamp-screw passing through the lugs,the two non-adj ustable conebearing sleeves in the bearing-opening, the two adjustable cone-bearing sleeves in the bearing-opening, provided with the circumferential holes, the journal in the cone-bearing sleeves, and the two sets of balls in contact with the journal and with their respective bearin g sleeves, substantially as set forth.

In testimony whereof l aix my signature in presence of two witnesses.

ARTHUR W. 'BROll/TNE. lVitnesses:

SEYMOUR CASE, M. A. COLE.

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